| Okean Elzy | Elektronische MusikRockSoundtrack | 5 |
| Owl City | PopRockKirchenmusik / Gospel | 3 |
| One Direction | TanzmusikPop | 6 |
| Papin Olympos | RockPop RockAlternative Musik / Alternative RockIndi-Musik | 5 |
| Don Omar | TanzmusikPop | 2 |
| Ottawan | DiscoPop | 8 |
| Turlough O'Carolan | Klassik | 6 |
| Sunn O))) | Rock | 1 |
| YK Osiris | Rap/ Hip-Hop | 1 |
| Oasis | RockBalladeAlternative Musik / Alternative Rock | 6 |
| Octavian | Pop | 1 |
| Birds of Tokyo | Alternative Musik / Alternative Rock | 1 |
